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SURVEY DRILLING AND GEOLOGY - Engineering Geological Survey Purposes - Survey Method- Field Test Results - fgdf- Result EvaluationEXPERIMENT TO DETERMINE THE PHYSICAL AND MECHANIC PROPER

BỘ GIÁO DỤC VÀ ĐÀO TẠO

Ho Chi Minh City University of Technology and Education

TEACHER COMMENT

SURVEY DRILLING AND GEOLOGY

- Engineering Geological Survey Purposes

- Survey Method

- Field Test Results

- fgdf

- Result Evaluation

EXPERIMENT TO DETERMINE THE PHYSICAL AND MECHANIC

PROPERTIES OF SOIL IN THE LABORATION

- Moisture Unit Weight and Moisture Contents Determination

Lab Test for Moisture Unit Weight Determination

Lab Test for Moisture Contents Determination

- Atterberg Limits Determination

- Grain Size Analysis

- Compaction Test

- Direct Shear Test

SURVEY DRILLING AND GEOLOGY

EXPERIMENT TO DETERMINE THE PHYSICAL AND MECHANIC PROPERTIES OF SOIL IN THE

LABORATION

LAB TEST 1: MOISTURE UNIT WEIGHT AND MOISTURE CONTENTS

DETERMINATION

1 PURPOSE OF THE EXPERIMENT

2 KHAI NIEM CAC DAI LUONG

3 TIEN HANH THI NGHIEM

A Lab Test for Moisture Unit Weight Determination

Equipments

Experimental process

- Step 1:

- Step 2:

- Step 3:

- Step 4:

4 EXPERIMENTAL RESULT

Bulk density and unit weight

Volume of cylinder (Cm3

Mass of cylinder + mass of

soil (g)

Average bulk density

(g/cm )3

2.11

Average Unit weight

(kN/m )3

20.7

LAB TEST 2: ATTERBERG LIMITS DETERMINATION

1 PURPOSE OF THE EXPERIMENT

2 KHAI NIEM CAC DAI LUONG

3 TIEN HANH THI NGHIEM

3.1 Equipments

Liquid limit device

Casagrande

Sieve 0.5mm Bow and

rammer

Spatula

Moisture can Balance Sccisor clamp Drying oven

3.2 Preparation process

- Step 1: Use naturally dried soil but dry soil temperature is below

60 degree

- Step2: Use about 200g this soil pulverized dry soil passing sieve 0,5mm

- Step 3:

3.3 Experimental process

- Step 1: Dry the Casagrande, then spread the mixed soil into Casa When spreading the soil, press down to avoid the appearance of air bubbles When spreading, must ensure the thickness of the soil layer to a depth of about 10mm (deepest point) the soil pat should form an approximately horizontal surface and just spread 2/3 surface

- Step 2: Using a grooving tool, carefully cut a line in the middle from the top to the bottom of the cup 2 sections have been slit 2mm apart at the bottom and the thickness of both sides of the trench is 8mm

- Step 3: Turn the crank of the apparatus at a speed of 2 drops / 1s the rise and fall of the cup dam into the base cause the land on both sides to collapse and gradually close

- Step 4: Take about 10 grams of the tested soil and put it in a moisture can to determine the weight then weigh the soil and moisture cans

- Step 5: Continue to mix the soil with the initial amount of dry soil repeat all the steps and determine the mass

- Step 6: After that, get 3 samples to put in the drying oven and conduct moisture determination

NOTE:

- The soil groove closes due to the impact of rotation of the cup dam into the base, not the sliding of the soil with the bottom of dics

- Use the same balance for all weighing

- To control soil moisture, samples must be mixed with dry soil and thoroughly mixed before testing

- If the number of drops exceeds 50, do not record the number of

- drops do the test by mixing more water into the soil paste

4 EXPERIMENTAL RESULT

LAB TEST 3: GRAIN SIZE ANALYSIS

1 PURPOSE OF THE EXPERIMENT

2 KHAI NIEM CAC DAI LUONG

3 TIEN HANH THI NGHIEM

3.1 Equipments

Set of sieve Drying oven Bow and rammer

3.2 Experimental process

- Step 1:

- Step 2:

- Step 3:

- Step 4:

4 EXPERIMENTAL RESULT

LAB TEST 4: COMPACTION TEST

1 PURPOSE OF THE EXPERIMENT

- Enhance the technical characteristics of the soil The compaction process reduces the pore volume of the soil Hence, reducing the void ratio, and deformation, and increasing the strength of the soil

- Reduce subsidence rate for future construction

2 KHAI NIEM CAC DAI LUONG

3 TIEN HANH THI NGHIEM

3.1 Equipments

Manual rammer and

mold

Graduated cylinder Drying oven Moisture can

3.2 Preparation steps

- Step 1: Use soil available in the laboratory (take dry soil to avoid lumpy soil)

- Step 2: Use a hammer to pound the soil and then sieve it through a 5mm sieve (remove the soil that does not pass through the sieve)

- Step 3: Weight the mold without the collar

3.3 Experimental process

Carry out the experiment 3 times step by step humidity of 5% 10% and 12% respectively

- Step 1: Use about 250 grams of soil sifted through a 5mm sieve mixed with water to calculate the moisture content so that it is 5%

- Step 2: Pour the soil into the mold in layers, each layer takes up 1/3 of the mold volume Use the available compaction tool for free fall and compact in layers (as shown)

NOTE: let the hammer fall freely and evenly distribute it on the surface of the ground

- Step 3: Install the collar and add more soil until the mold is filled and continue the compaction process After compaction, the soil protrudes no more than 1cm from the face of the mold and does not concave below the face of the mold

- Step 4: When finished, remove the collar carefully, and use a knife

to remove excess soil When removing avoid surface convexity, if it happens use similar soil to cover it and flatten it

- Step 5: Weigh the compacted soil while it’s in the mold and record the mass

- Step 6: Remove the soil from the mold with a mechanical extruder and using the knife take a small amount of the soil sample into an moisture can and determine the moisture content